mmdebstrap-autopkgtest-build-qemu: pipe tarball to mke2fs and make bit-by-bit reproducible
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1 changed files with 45 additions and 41 deletions
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@ -29,10 +29,11 @@ B<mmdebstrap-autopkgtest-build-qemu> [I<OPTIONS>] B<--boot>=B<efi> I<RELEASE> I<
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B<mmdebstrap-autopkgtest-build-qemu> is a mostly compatible drop-in replacement
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for L<autopkgtest-build-qemu(1)> with two main differences: Firstly, it uses
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L<mmdebstrap(1)> instead of L<vmdb2(1)> and thus is able to create QEMU disk
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images without requiring superuser privileges. Secondly, it uses
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L<systemd-boot(7)> and thus only supports booting via EFI. For architectures
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for which L<autopkgtest-virt-qemu(1)> does not default to EFI booting you must
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pass B<--boot=efi> when invoking the autopkgtest virt backend.
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images without requiring superuser privileges and with bit-by-bit reproducible
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output. Secondly, it uses L<systemd-boot(7)> and thus only supports booting via
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EFI. For architectures for which L<autopkgtest-virt-qemu(1)> does not default
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to EFI booting you must pass B<--boot=efi> when invoking the autopkgtest virt
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backend.
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=head1 POSITIONAL PARAMETERS
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@ -110,6 +111,12 @@ all path components or by creating the image in a world-readable directory like
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Make sure to add B<--boot=efi> to both the B<mmdebstrap-autopkgtest-build-qemu>
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as well as the B<autopkgtest-virt-qemu> invocation.
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Create bit-by-bit reproducible images from a given snapshot.d.o timestamp.
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SOURCE_DATE_EPOCH=1612543740 mmdebstrap-autopkgtest-build-qemu --boot=efi \
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--mirror=http://snapshot.debian.org/archive/debian/20210205T164900Z/ \
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unstable /path/to/debian-unstable.img
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=head1 SEE ALSO
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L<autopkgtest-build-qemu(1)>, L<autopkgtest-virt-qemu(1)>, L<mmdebstrap(1)>, L<autopkgtest(1)>
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@ -273,7 +280,7 @@ test_installed() {
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fi
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}
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for pkg in autopkgtest dosfstools e2fsprogs fdisk mount mtools passwd uidmap; do
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for pkg in autopkgtest dosfstools e2fsprogs fdisk mount mtools passwd uidmap libarchive13; do
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test_installed "$pkg"
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done
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@ -320,33 +327,24 @@ FAT_SIZE_SECTORS=$((1024*254))
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# - snapshots and overlays work just as well with raw images
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# - users who prefer qcow2 get to choose to run it themselves with their own
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# custom options like compression
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#
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# --map-users=auto --map-user=0 => 0:$UID:1 + 1:$SUBUIDBASE:65535
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# --map-users=auto --map-user=65536 => 0:$SUBUIDBASE:65536 + 65536:$UID:1
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#
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# Make the image writeable to the first subgid. mmdebstrap will map this gid to
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# the root group. unshare instead will map the current gid to 0 and the first
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# subgid to 1. Therefore mmdebstrap will be able to write to the image.
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rm -f "$IMAGE"
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: >"$IMAGE"
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unshare --map-user=0 --map-group=0 --map-groups=auto chown 0:1 "$IMAGE"
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chmod 0660 "$IMAGE"
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# Make sure that the unshared user is able to access the file.
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# Alternatively to using /sbin/mkfs.ext4 could use --format=ext2 which would
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# add an extra copy operation and come with the limitations of ext2.
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# Another solution: https://github.com/tytso/e2fsprogs/pull/118
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if ! mmdebstrap --unshare-helper touch "$IMAGE"; then
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die "$IMAGE cannot be accessed by the unshared user -- either make all path components up to the image itself world-executable or place the image into a world-readable path like /tmp"
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fi
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set -- \
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--mode=unshare \
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--format=tar \
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--variant=important \
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--architecture="$ARCHITECTURE"
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test "$RELEASE" = jessie &&
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case $MIRROR in http://snapshot.debian.org/archive/*|https://snapshot.debian.org/archive/*)
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set -- "$@" --aptopt='Acquire::Check-Valid-Until "false"';;
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esac
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EXT_FEATURES=
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if test "$RELEASE" = jessie; then
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set -- "$@" --keyring=/usr/share/keyrings/debian-archive-removed-keys.gpg
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set -- "$@" --aptopt='Apt::Key::gpgvcommand "/usr/libexec/mmdebstrap/gpgvnoexpkeysig"'
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set -- "$@" --hook-dir=/usr/share/mmdebstrap/hooks/jessie-or-older
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EXT_FEATURES="^metadata_csum,^metadata_csum_seed,^orphan_file"
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fi
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set -- "$@" \
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"--include=init,$LINUXIMAGE,python3" \
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@ -364,30 +362,35 @@ if test -n "$SCRIPT"; then
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'--customize-hook=rm -f "$1/userscript"'
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fi
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EXT4_OFFSET_BYTES=$(( (FAT_OFFSET_SECTORS + FAT_SIZE_SECTORS) * 512))
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EXT4_OPTIONS="offset=$EXT4_OFFSET_BYTES,assume_storage_prezeroed=1"
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# the --no-mtab option to mount is a workaround for https://github.com/util-linux/util-linux/issues/2981
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# revert 8c0ddc32660ca4e98c988966251f9c05d6bcccef once it is no longer needed
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set -- "$@" \
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"--customize-hook=download vmlinuz '$WORKDIR/kernel'" \
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"--customize-hook=download initrd.img '$WORKDIR/initrd'" \
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'--customize-hook=mount --no-mtab --bind "$1" "$1/mnt"' \
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'--customize-hook=mount --no-mtab --bind "$1/mnt/mnt" "$1/mnt/dev"' \
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'--customize-hook=/sbin/mkfs.ext4 -d "$1/mnt" -L autopkgtestvm -E '"'$EXT4_OPTIONS' '$IMAGE' '$SIZE'" \
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'--customize-hook=umount --lazy --no-mtab "$1/mnt/dev"' \
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'--customize-hook=umount --lazy --no-mtab "$1/mnt"' \
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"$RELEASE" \
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/dev/null
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-
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test -n "$MIRROR" && set -- "$@" "$MIRROR"
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test -n "$KEYRING" && set -- "$@" "--keyring=$KEYRING"
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echo "mmdebstrap $*"
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mmdebstrap "$@" || die "mmdebstrap failed"
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echo "+ mmdebstrap $*" >&2
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# https://github.com/koalaman/shellcheck/issues/2555
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# shellcheck disable=SC3040
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set -o pipefail
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mmdebstrap "$@" | {
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set -- -t ext4 -L autopkgtestvm -d -
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if test -n "$EXT_FEATURES"; then
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set -- "$@" -O "$EXT_FEATURES"
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fi
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EXTOPTS="offset=$(( (FAT_OFFSET_SECTORS + FAT_SIZE_SECTORS) * 512))"
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if test -n "${SOURCE_DATE_EPOCH:-}"; then
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uuid="$(uuidgen --sha1 --namespace="$(uuidgen --sha1 --namespace='@dns' --name mister-muffin.de)" --name "$SOURCE_DATE_EPOCH")"
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set -- "$@" -U "$uuid"
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EXTOPTS="$EXTOPTS,hash_seed=$uuid"
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fi
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set -- "$@" -E "$EXTOPTS" "$IMAGE" "$SIZE"
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echo "+ mke2fs $*" >&2
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/sbin/mke2fs "$@"
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}
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unshare -U -r --map-groups=auto chown 0:0 "$IMAGE"
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chmod "$(printf %o "$(( 0666 & ~0$(umask) ))")" "$IMAGE"
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echo "root=LABEL=autopkgtestvm rw console=ttyS0" > "$WORKDIR/cmdline"
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@ -461,4 +464,5 @@ if test -n "$VMFPKG" && test "$(dpkg-query -f '${db:Status-Status}' -W "$VMFPKG"
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echo "I: you might need to install $VMFPKG to use this image with autopkgtest-virt-qemu" >&2
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fi
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echo "I: don't forget to pass --boot=efi when running autopkgtest-virt-qemu with this image" >&2
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echo "I: SUCCESS! Your new image can be found here: $IMAGE" >&2
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echo "I: Don't forget to pass --boot=efi when running autopkgtest-virt-qemu with this image" >&2
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